Herbicidal beta-pyrazolylacrylic acid compound

ABSTRACT

This application discloses hebricidal B-pyrazolylacrylic acids, compositions containing them, methods of preparing them, and methods for controlling undesired plant growth by preemergent or postemergent application of the herbicidal compositions to the locus where control is desired. The herbicidal compounds have the formula ##STR1## in which the radicals are defined in the claims.

This invention pertains to novel B-pyrazolyacrylic acids and their use for weed control in agriculture, horticulture, and other fields in which it is desired to control unwanted plant growth, such as grassy or broadleaf plant species In particular it pertains to 3-[4-cyano-1-(substituted-phenyl or -pyridyl)-1H-pyrazol-5-yl]acrylates as pre- and postemergence herbicides. The use of this class of herbicides is heretofore unknown.

A variety of herbicidal 1-arylpyrazoles have previously been described. For example, U.S. Pat. No. 4,459,150 describes the use as herbicides of compounds of the following structure: ##STR2## wherein R¹ represents R⁸ C(═O)--wherein R⁸ represents H, C₁₋₇ alkyl or C₁₋₄ alkoxy optionally substituted by C₁₋₄ alkoxy, C₂₋₅ alkoxycarbonyl or halogen, C₃₋₄ alkenyloxy, C₃₋₆ cycloalkyl optionally substituted by CH₃ or C₂ H₅, or phenoxy, R² represents H or R⁸ C(═O)--, or R¹ and R² together represent --CO--(CR¹ R^(b))_(m) --CO--, R³ represents F, Cl, Br, C₁₋₄ alkyl optionally substituted by halogen, or C₂₋₄ alkenyl, R⁴ represents F, Cl, Br, NO₂, CH₃ or C₂ H₅ and R⁵, R⁶ and R⁷ represent H, F, Cl, Br, NO₂, CH₃ or C₂ H₅, or

R⁴ and R⁵ each represent Cl and R³, R⁶ and R⁷ each represent H, R^(a) and R^(b) represent H or C₁₋₄ alkyl, and m is 2 or 3. British Patent Application 2136427A describes the following herbicidal N-pyridylpyrazole derivatives: ##STR3## wherein R¹ is hydrogen, R⁴ C(═O)--, or R⁵ (R⁵ is amongst others C₁₋₈ alkyl); R² is hydrogen when R¹ is hydrogen, or R⁴ C(═O)- when R¹ is R⁴ C(═O)--, or hydrogen or R⁵ when R¹ is R⁵, or R¹ and R² may be taken together to form ring systems, and R³ is 3-chloro-5-trifluoromethylpyridin-2-yl.

U.S. Pat. No. 4,496,390 describes the following N-phenylpyrazole derivatives as herbicides: ##STR4## wherein each of R⁵ and R⁶ represents a C₁₋₄ alkyl or alkoxy radical, a trifluoromethyl, trifluoromethoxy, nitro, cyano or primary amino radical, or a fluorine, chlorine or bromine atom, each of R⁷, R⁸ and R⁹ represents a hydrogen atom, a C₁₋₄ ifluoromethoxy, nitro, cyano or primary amino radical or a fluorine, chlorine or bromine atom, or R⁵, R⁷, R⁸ and R⁹ each represents a hydrogen atom and R⁶ represents a trifluoromethoxy or trifluoromethyl radical, and R¹⁰ represents a cyano radical or substituted carbamoyl radical --CONHR¹¹, wherein R¹¹ represents a methyl or ethyl radical.

U.S. Pat. No. 4,563,210 discloses the following herbicidal 5-halo-1-halophenyl-1H-pyrazole-4-carbonitriles: ##STR5## wherein each R¹ independently is halogen; R² is halo or trifluoromethyl; and n is 1-5; with the provisos that when n is 1, R¹ is other than fluorine, and when n is 2 and each R¹ is chlorine, at least one R¹ is located at a para or ortho position on the phenyl ring.

U.S. Pat. No. 4,629,495 disclose 5-amino-4-cyano-1-phenylpyrazoles: ##STR6## wherein A represents R¹ R² N- wherein R¹ represents C₁₋₈ alkyl or C₂₋₈ alkenyl or alkynyl unsubstituted or substituted by CN, OH, C₁₋₆ alkoxy, carboxy, C₂₋₉ alkoxycarbonyl, aminocarbonyl optionally substituted by C₁₋₈ alkyl or C₂₋₈ alkenyl, C₁₋₈ alkoxyaminocarbonyl, C₁₋₈ alkanesulphonamidocarbonyl, --C(═O)-Het, where Het represents a nitrogen-containing heterocyclic group, or one or more halogen atoms or R¹ represents C₃₋₆ cycloalkyl optionally substituted by C₁₋₄ alkyl and R² represents H or R¹ , or R¹ represents C₁₋₄ alkylthio and R² represents H, or A represents R^(p) (R^(q))--C═N-- (wherein R^(q) represents C₁₋₄ alkoxy or amino substituted by one or two C₁₋₄ alkyl groups and R^(q) represents H or C₁₋₄ alkyl) or A represents 2-oxoazetidin-1-yl, 2-oxo-pyrrolidin-1-yl or 2-oxopiperidin-1-yl optionally substituted by C₁₋₆ alkyl or A represents open-chain alkenylcarbonylamino and B represents phenyl substituted in the 2-position by F, Cl, Br, NO₂, --CH₃ or --C₂ H₅ and in the 4-position by F, Cl, Br, C₁₋₄ (optionally substituted by halogen) or C₂₋₄ alkenyl and alkynyl and optionally substituted in the 3-, 5- and 6-positions by F, Cl, Br, NO₂, --CH₃ or --C₂ H.sub. 5, or B represents 2,3-dichlorophenyl, and salts thereof.

U.S. Pat. No. 4,685,956 discloses the following 1-aryl-5-hydrazinopyrazoles, compositions containing them, and herbicidal methods of using them: ##STR7## in which R¹ represents hydrogen or alkyl;

R² represents cyano or nitro;

R³ represents hydrogen, or represents in each case optionally substituted alkyl, alkenyl, alkynyl or cycloalkyl, or represents a radical --C(═X)--R⁶, or represents a radical --SO₂ --R⁷ ;

R⁴ represents hydrogen, or represents in each case optionally substituted alkyl, alkenyl, alkynyl or cycloalkyl, or represents a radical --C(═X)--R⁶, or represents a radical --SO₂ --R⁷ ;

R⁵ represents hydrogen or, in the case where R⁴ represents hydrogen, also represents a radical --C(═X)--R⁶, or represents a radical --SO₂ --R⁷, or represents in each case optionally substituted alkyl, alkenyl, alkynyl or cycloalkyl, wherein, in each case;

X represents oxygen or sulfur,

R⁶ represents hydrogen, alkyl, alkoxy, alkoxyalkyl, alkylthio, alkylthioalkyl, alkylamino, dialkylamino, halogenoalkyl, alkenyl or alkynyl, or represents optionally substituted cycloalkyl, or represents in each case optionally substituted aryl, aryloxy, arylthio or arylamino and;

R⁷ represents alkyl, hydroxyalkyl, alkoxyalkyl, halogenoalkyl, alkenyl, alkynyl or cycloalkyl, or represents in each case optionally substituted aralkyl or aryl and;

Ar represents substituted phenyl, or represents optionally substituted pyridyl.

U.S. Pat. No. 4,685,957 disclose the following 1-aryl-5iminoaminopyrazoles, compositions containing them, and herbicidal methods of using them: ##STR8## in which R¹ represents hydrogen or alkyl,

R² represents cyano or nitro,

R³ and R⁴ independently of one another each represent hydrogen, alkyl, alkoxyalkyl, alkylthioalkyl or halogenoalkyl or represent optionally substituted aryl, or

R³ and R⁴ together represent a divalent alkylene radical,

R⁵ represents hydrogen or alkyl and

Ar represents optionally substituted phenyl, or represents optionally substituted pyridyl

U.S. Pat. No. 4,770,692 discloses the following 4-cyano-(nitro)-5-oxy(thio)pyrazole derivatives, compositions containing them, and herbicidal and plant growth regulating methods of using them: ##STR9## in which R¹ represents hydrogen, alkyl or halogenoalkyl,

R² represents nitro or cyano,

R³ represents optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted cycloalkyl, optionally substituted cycloalkylalkyl, optionally substituted aralkyl or optionally substituted aryl,

Ar represents phenyl which is substituted twice or more, or optionally substituted pyridyl, and

Y represents O, S, SO or SO₂.

U.S. Pat. No. 4,770,693 claims the following 5-acylamino-1-phenylpyrazoles, compositions containing them, and herbicidal method of using them: ##STR10## in which R¹ represents cyano, alkoxycarbonyl, alkenyloxycarbonyl, alkynyloxycarbonyl, aminocarbonyl, alkylaminocarbonyl, alkenylaminocarbonyl or alkynylaminocarbonyl,

R² represents hydrogen, alkyl, alkenyl, alkynyl, optionally substituted cycloalkyl, alkoxyalkyl, alkylthioalkyl, halogenoalkyl or optionally substituted aryl and

R³, R⁴, R⁵, R⁶ and R⁷, which are identical or different, represent hydrogen, halogen, cyano, nitro, alkyl, alkoxy, alkylsulfonyl, alkoxycarbonyl or a radical --R⁸ ;

wherein R⁸ represents halogenoalkyl, with the proviso that at least one of the radicals R³, R⁴, R⁵, R⁶ or R⁷ represents a radical --R⁸, but R¹ does not represent cyano if R⁵ represents trifluoromethyl.

U.S. Pat. No. 4,770,688 claims the following 5-azido or 5-phosphorimido-1-arylpyrazoles, compositions containing them, and herbicidal and plant growth regulating methods of using them: ##STR11## in which R represents cyano or nitro,

Ar represents in each case optionally substituted phenyl or pyridyl,

X represents an azido group, or represents the radical ##STR12## and

R¹ , R² and R³ each independently represents alkyl, alkenyl, alkynyl, halogenoalkyl, alkoxy, alkoxyalkyl, cycloalkyl or cycloalkyloxy, or represents in each case optionally substituted aryl, aryloxy, aralkyl or aralkyloxy;

but wherein, in the case where R represents cyano and X simultaneously represents an azido group, Ar does not represent unsubstituted phenyl and does not represent 5-nitro-2-pyridyl.

U.S. Pat. No. 4,772,312 claims the following 5-amino-1-pyridylpyrazoles, compositions containing them, and herbicidal method of using them: ##STR13## in which R¹ represents hydrogen or represents alkyl with 1 to 12 carbon atoms,

R² represents hydrogen, nitro, nitroso or halogen, or represents a radical --C(O)--R⁵, wherein R⁵ represents hydrogen, hydroxyl, alkyl, alkenyl, alkynyl, halogenoalkyl, alkoxyalkyl or alkylthioalkyl, or optionally substituted cycloalkyl, or optionally substituted aryl, or represents alkoxy or alkylthio, or optionally substituted aryloxy, or optionally substituted arylthio, alkylamino or dialkylamino, or optionally substituted arylamino,

R³ represents hydrogen, or a radical --C(X)--R⁶, or a radical --S(O)n--R⁷, R⁴ represents hydrogen, or alkyl, or a radical --C(X)--R⁶, or a radical --S(O)n--R⁷, and in the case where R³ represents an --SO₂ --R⁷ radical, also represents an inorganic or organic cation bonded in salt form, and

R⁶ represents hydrogen, alkyl, alkenyl, alkynyl, halogenoalkyl, alkoxyalkyl or alkylthioalkyl, or optionally substituted cycloalkyl, or optionally substituted aryl, or alkoxy or alkylthio, or optionally substituted aryloxy, or optionally substituted arylthio, or alkylamino or dialkylamino, or optionally substituted arylamino,

X represents oxygen or sulphur,

n represents the number 0, 1 or 2;

R⁷ represents alkyl, halogenalkyl or optionally substituted aryl; and

Py represents substituted C-linked pyridyl.

U.S. Pat. No. 4,787,930 claims the following 5-amino-1-phenylpyrazole herbicides and plant growth regulators: ##STR14## in which R¹ represents hydrogen, or alkyl of 1 to 12 carbon atoms;

R² represents hydrogen, nitro, nitroso, or hydrogen or --C(═O)R⁵ ;

R³ represents hydrogen, --C(═X)R⁶, or --S(O)n--R⁷ ; and

R⁴ represents hydrogen, alkyl, --C(═X)R⁶, or --S(O)n--R⁷, or in the case where R³ represents a --SO₂ --R⁷ radical or a --CO--C_(m) F_(2m+1) radical, also represents an inorganic or organic cation bonded in salt form.

U.S. Pat. No. 4,435,208 claims the following herbicidally active substituted phenoxycinnamic acid derivatives: ##STR15## in which R¹ represents a hydrogen or chlorine atom;

R² represents a hydrogen atom, a cyano group, an optionally substituted radical selected from alkyl, aryl, alkanoyl, benzoyl, alkoxycarbonyl, alkenoxycarbonyl, alkynoxycarbonyl, aralkoxycarbonyl and aryloxycarbonyl, or a radical of the general formula --COOM, in which M represents a hydrogen atom, one equivalent of an alkali metal ion or alkaline earth metal ion or optionally substituted ammonium, and

R³ represents a cyano group or a radical of the general formula --CO--[Y--(CR⁴ R⁵)--CO)_(n) --Z;

wherein Y represents an oxygen or sulfur atom or an imino (NH) or alkylimino (N-alkyl) group,

R⁴ and R⁵ independently or each other represent a hydrogen atom or a methyl group,

n is 0 or 1; and Z represents an optionally substituted radical.

DETAILED DESCRIPTION OF THE INVENTION

It has now been discovered that b-pyrazolylacrylic acid derivatives of the following structure are highly active herbicides: ##STR16## wherein X is chlorine or fluorine, X¹ is hydrogen, chlorine, or fluorine, X² is chlorine, fluorine, trifluoromethyl, or ethoxy, and X³ is hydrogen, chlorine, or fluorine, or when M is --CH--, --CF--, --CCl--, or --N--; and R¹ is --CH═C(--R²)--C(═O)--Z--[S(O)₂ ]_(n) --R³

wherein R² is hydrogen or methyl; Z is --O--, --S--, or --NR⁴ --; and n is 0 or 1;

when Z is --O-- or --S-- and n is O, R³ is selected from the group consisting of hydrogen, sodium, lower alkyl, cyanomethyl, propargyl, isopropylideneamino, dihydrofuran-2(3H)-one-3-yl, phenylmethyl optionally substituted in the 4-position with methylthio, and --R⁵ --COR⁶, where R⁵ is a divalent alkylene of 1 to 3 carbons and R⁶ is hydrogen, amino, dimethylamino, methylsulfonylamino, or an alkoxy of 1 to 4 carbons;

when Z is --NR⁴ -- and n is O, R³ is selected from the group consisting of hydrogen, lower alkyl, methoxy, 1-cyano-1-methylethyl, ethoxycarbonylmethyl, phenylmethyl, and phenyl; and R⁴ is hydrogen, methyl, or taken with R³ --C₂ H₅ OC₂ H₅ -- to form a morpholine ring;

when Z is --NR⁴ -- and n is 1, R³ is selected from the group consisting of lower alkyl, trifluoromethyl, cyclohexylmethyl, 2-phenylethyl, 2-phenylethenyl, amino, d-10-camphoryl, 3,5-dimethylisoxazol-4-yl, phenylmethyl optionally substituted with one or more of chlorine, bromine, fluorine, or methyl, and phenyl optionally substituted with chlorine or methyl; and R⁴ is hydrogen; in addition when R² is hydrogen and R³ is lower alkyl or phenylmethyl, R⁴ may be sodium.

Lower alkyl means a straight or branched chain of 1 to 4 carbon atoms.

Preferred compounds are those

wherein X is chlorine, X¹ is hydrogen or chlorine, X² is chlorine or trifluoromethyl, and X³ is hydrogen, M is --CH-- or --N--, and Z is --O-- or --NR⁴ --;

when Z is --O-- and n is 0, R³ is selected from the group consisting of hydrogen, sodium, methyl, ethyl, phenylmethyl, and --R⁵ --COR⁶ in which R⁶ is hydroxy or an alkoxy of 1 to 4 carbons;

when Z is --NR⁴ -- and n is 0, R³ is selected from the group consisting of hydrogen, lower alkyl, ethoxycarbonylmethyl, phenylmethyl, and phenyl; and R⁴ is hydrogen, methyl, or taken with R³ --C₂ H₅ OC₂ H₅ -- to form a morpholine ring;

Z is --NR⁴ -- and n is 1, R³ is selected from the group consisting of lower alkyl of 1 to 4 carbon atoms, or phenylmethyl optionally substituted with one or two of chlorine or methyl; and R⁴ is hydrogen; in addition when R² is hydrogen, and R³ is methyl, 1-methylethyl, or phenylmethyl, R⁴ may also be sodium.

Particularly preferred compounds are those

wherein X is chlorine, X¹ is hydrogen or chlorine, X² is chlorine or trifluoromethyl, and X³ is hydrogen, M is --N--, and Z is --O-- or --NR⁴ --; when Z is --O-- and n is 0, R³ is selected from the group consisting of hydrogen, sodium, methyl, ethyl, carboxymethyl, 1-carboxyethyl, methoxycarbonylmethyl, ethoxycarbonylmethyl, 1,1-dimethylethoxycarbonylmethyl, 1-(methoxycarbonyl)ethyl, 1-(1,1-dimethylethoxyoarbonyl)ethyl, and phenylmethyl;

when Z is --NR⁴ -- and n is 0, R³ is selected from the group consisting of hydrogen, methyl, and 1-methylpropyl; and R⁴ is hydrogen or methyl;

when Z is --NR⁴ -- and n is 1, R³ is selected from the group consisting of lower alkyl or phenylmethyl; and R⁴ is hydrogen; in addition when R² is hydrogen, and R³ is methyl, 1-methylethyl, or phenylmethyl, R⁴ may also be sodium.

The compounds of the present invention were prepared by methods known to those of ordinary skill in the art.

The 5-amino-4-cyano-1-(substituted-phenyl)-1H-pyrazoles and 5-amino-4-cyano-1-(substituted-pyridin-2-yl)- 1H-pyrazoles) used as intermediates in preparing the compounds of the present invention are known and are disclosed as herbicides in U.S. Pat. No. 4,496,390.

The 5-amino-4-substituted-1-aryl-1H-pyrazole intermediates were converted to the corresponding diazonium salts with tert-butyl nitrite. The diazonium salts were then subjected to a modified Meerwein reaction, as described by M. P. Doyle et al., J.Org. Chem., 42, 14, 2431 (1977), with a lower alkyl acrylate and copper(II) chloride in acetonitrile, affording the corresponding lower alkyl 2-chloro-3-[4-substituted-1-aryl-1H-pyrazol-5-yl]propionates. The lower alkyl propionates were then dehydrohalogenated with sodium hydride in dimethylformamide, yielding the corresponding lower alkyl 3-[4-substituted-1-aryl-1H-pyrazol-5-yl]acrylates, as exemplified in Example 1 below.

Alternatively, the lower alkyl propionates were dehydrohalogenated with potassium carbonate in 50% aqueous ethanol and then hydrolyzed with concentrated hydrochloric acid, yielding the corresponding 3-[4-substituted-1-aryl-1H-pyrazol-5-yl]acrylic acids, as exemplified in Example 2 below. The acrylic acids were optionally converted to their acid chlorides, which were in turn reacted with various alcohols, thiols, amines, and sulfonamides by well-known procedures, yielding the corresponding acrylic acid derivatives of the present invention. These procedures are shown in Examples 7-11 below.

The acrylic acids were also reacted with an appropriately substituted halogen intermediate under basic conditions in a solvent, for example, acetone, yielding the corresponding acrylic acid esters. This type of chemistry was usually employed to produce complex acid esters, for example, in which R³ is 1,1-dimethylethoxycarbonylmethyl, as in Example 12 below. The complex esters were optionally hydrolyzed with trifluoroacetic acid, yielding a complex acid, for example, in which R³ is carboxymethyl, as in Example 13 below.

An alternative route to compounds of the invention, bypassing the 5-amino-1-aryl-4-cyano-1H-pyrazole intermediates, is exemplified in Example 5 below.

EXAMPLE 1 Synthesis of Ethyl 3-[4-Cyano-1-(2,3,4-Trichlorophenyl)-1H-Pyrazol-5-Yl ]Acrylate (Compound 6)

Step A: Ethyl 2-chloro-3-[4-cyano-1-(2,3,4-trichlorophenyl)-1H-pyrazol-5-yl]propionate

To a stirred solution of 1.6 grams (0.015 mole) of tert-butyl nitrite in 20 mL of ethyl acrylate and 20 mL of acetonitrile was added 1.2 grams (0.012 mole) of copper(II) chloride. Upon completion of addition, the reaction mixture was stirred for five minutes, and then 2.9 grams (0.01 mole) of 5-amino-4-cyano-1-(2,3,4-trichlorophenyl)-1H-pyrazole was added in portions. Upon completion of the addition, the reaction mixture was stirred for 2.75 hours at a temperature of about 27° C. After this time, the reaction mixture was poured into 150 mL of aqueous 20% hydrochloric acid, where it was stirred for 10 minutes. The two-phase mixture was extracted with methylene chloride. After the extract had been standing for a few minutes, an oily solid separated out. This solid was collected by filtration, and nmr analysis showed that it was not the proposed product. The methylene chloride filtrate was washed with aqueous 20% hydrochloric acid and then with water. The organic layer was dried with magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure, yielding 3.6 grams of crude, oily product. A 2.0 gram sample of the crude product was subjected to column chromatography on silica gel with 1:1 heptane/ethyl acetate eluent. Those fractions found by thin layer chromatography to contain a major constituent other than eluent and starting materials were combined and concentrated under reduced pressure, yielding 0.9 gram of ethyl 2-chloro-3-[4-cyano-1-(2,3,4-trichlorophenyl)-1H-pyrazol-5-yl]propionate. The nmr spectrum was consistent with the proposed structure.

Step B: Ethyl 3-[4-cyano-1-(2,3,4-trichlorophenyl)-1H-pyrazol-5-yl]acrylate

To a stirred, slightly warmed solution of 1.4 grams (0.003 mole) of ethyl 2-chloro-3-[4-cyano-1-(2,3,4-trichlorophenyl)-1H-pyrazol-5-yl]propionate in 25 mL of N,N-dimethylformamide was added in one portion 0.1 gram (0.004 mole) of sodium hydride. Upon completion of the addition the reaction mixture was warmed to about 60° C., where it was stirred for 1.75 hours. The reaction mixture was then allowed to cool to ambient temperature, where it was stirred for about 18 hours. The reaction mixture was again warmed to about 60° C., where it was stirred for two hours. The reaction mixture was cooled and concentrated under reduced pressure. The residue remaining was stirred with water for about 40 minutes, giving a solid that was collected by filtration. The solid was recrystallized from ethanol and water, yielding 0.6 gram of ethyl 3-[4-cyano-1-(2,3,4-trichlorophenyl)-1H-pyrazol-5-yl]acrylate, m.p. 131°-134° C. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 2 Synthesis of 3-[4-Cyano-1-(2,3,4-Trichlorophenyl)-1H-Pyrazol-5-Yl]Acrylic Acid (Compound 4)

A stirred slurry of 0.35 gram (0.0009 mole) of ethyl 2-chloro-3-[4-cyano-1-(2,3,4-trichlorophenyl)-1H-pyrazol-5-yl]propionate and 0.24 gram (0.002 mole) of potassium carbonate in 35 mL of 50% aqueous ethanol was heated at reflux for one hour. The reaction mixture was then cooled and concentrated under reduced pressure, leaving a residue. The residue was dissolved in water, and the solution was washed once with methylene chloride. The aqueous layer was stirred and acidified by the dropwise addition of concentrated hydrochloric acid. Upon acidification, the mixture was stirred for one hour, and the resultant solid was collected by filtration. The solid was dried, yielding 0.21 gram of 3-[4-cyano-1-(2,3,4-trichlorophenyl)-1H-pyrazol-5-yl]acrylic acid; m.p. 215°-219° C. A small sample was recrystallized from ethanol and water to raise the m.p. to 226.5°-228.5° C. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 3 Synthesis of Methyl 3-[4--Cyano-1-(3-Chloro-5-trifluoromethylpyridin-2-Yl)-1H-Pyrazol-5-Yl]Acrylate (Compound 16)

Step A: Methyl 2-chloro-3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5yl]propionate

This compound was prepared in a manner analogous to that of Example 1, Step A, using 5.8 grams (0.020 mole) of 5-amino-4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole, 3.1 grams (0.030 mole) of tert-butyl nitrite, 3.2 grams (0.024 mole) of copper(II) chloride, and 40 mL of methyl acrylate in 40 mL of acetonitrile. The yield of methyl 2-chloro-3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]propionate was 7.2 grams. The nmr spectrum was consistent with the proposed structure.

Step B: Methyl 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylate

This compound was prepared in a manner analogous to that of Example 1, Step B, using 1.S grams (0.004 mole) of methyl 2-chloro-3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]propionate and 0.12 gram (0.005 mole) of sodium hydride in 25 mL of N,N-dimethylformamide. The yield of methyl 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylate was 0.3 gram, isolated as a waxy solid. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 4 Synthesis of 3-[4-Cyano-1-(3-Chloro-5-TrifluoroMethylpyridin-2-Yl)-1H-Pyrazol-5-Yl]Acrylic Acid (Compound 14)

This compound was prepared in a manner analogous to that of Example 2, using 1.2 grams (0.003 mole) of methyl 2-chloro-3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]propionate and 0.8 gram (0.006 mole) of potassium carbonate in 10 mL of water and 25 mL of ethanol. The yield of 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid was 0.6 gram; m.p. 225°-228° C. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 5 Synthesis of 3-[4-Cyano-1-(3-Chloro-5-Trifluoromethylpyridin-2-Yl)-1H-Pyrazol-5-Yl]Acrylic Acid (Compound 14)

Step A: 4-Ethoxycarbonyl-5-methyl-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole

A stirred solution of 44.0 grams (0.21 mole) of 3-chloro-5-trifluoromethylpyridin-2-ylhydrazine and 38.6 grams (0.21 mole) of ethyl 2-acetyl-3-dimethylaminoacrylate, prepared by the method of J. R. Beck et al., J. Het. Chem., 24, 693 (1987), in 1000 mL of ethanol was heated at reflux for five hours. After this time, the reaction mixture was cooled to ambient temperature and concentrated under reduced pressure to a residual oil. The oil was taken up in methylene chloride and washed in succession with two 100 mL portions of aqueous 10% hydrochloric acid, an aqueous solution saturated with sodium bicarbonate, and water. The organic layer was dried and filtered. The filtrate was concentrated under reduced pressure, yielding 48.9 grams of 4-ethoxycarbonyl-5-methyl-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole. The nmr spectrum was consistent with the proposed structure.

Step B: 4-Carboxy-5-methyl-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole

A stirred solution of 36.0 grams (0.11 mole) of 4-ethoxycarbonyl-5-methyl-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole, prepared by the method of J. R. Beck et al., J. Het. Chem., 24, 693 (1987), and 53 mL of aqueous 10% sodium hydroxide in 145 mL of water and 390 mL of ethanol was heated at reflux for 30 minutes. After this time, the reaction mixture was concentrated under reduced pressure to a residue. The residue was poured into 600 mL of ice water. The mixture was acidified with concentrated hydrochloric acid, yielding a gummy solid. Small portions of the gummy solid were triturated with petroleum ether, yielding, when combined, 21.5 grams of solid 4-carboxy-5-methyl-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole. The nmr spectrum was consistent with the proposed structure.

Step C: 4--Cyano-5-methyl-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole

A stirred solution of 16.5 grams (0.054 mole) of 4-carboxy-5-methyl-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole in 80 mL of thionyl chloride was heated at reflux for three hours. The reaction mixture was cooled and concentrated under reduced pressure, yielding the corresponding 4-carboxylic acid chloride. The acid chloride was taken up in 5 mL of tetramethylene sulfone, and 6.4 grams of sulfamide was added. The reaction mixture was heated, with stirring, at 120°-130° C. for one hour, after which the reaction mixture was poured into a solution consisting of 100 mL of aqueous 10% sodium hydroxide and 200 mL of water. The mixture was cooled, and a solid was collected by filtration. The solid was dissolved in methylene chloride, and the solution was dried with magnesium sulfate. The mixture was filtered and the filtrate was concentrated under reduced pressure, yielding 14.0 grams of 4-cyano-5-methyl-1-(3-chloro-5-trifluoromethylpyridin-1-yl)-1H-pyrazole. The nmr spectrum was consistent with the proposed structure.

Step D: 5-Bromomethyl-4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole

To a stirred solution of 13.7 grams (0.05 mole) of 4-cyano-5-methyl-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole in 140 mL of carbon tetrachloride was added 12.8 grams (0.07 mole) of N-bromosuccinimide. The reaction mixture was brought to reflux with illumination from a 150 watt lamp and maintained at reflux for 2.5 hours. The reaction mixture was cooled and then washed several times with an aqueous solution saturated with sodium chloride. The organic layer was dried with magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure, yielding 14.6 grams of solid that was predominantly 5-bromomethyl-4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole. The nmr spectrum was consistent with the proposed structure.

Step E: 1-[[4--Cyano-1-(3-chloro-5-trifluoromethyl pyridin-2-yl)-1H-pyrazol-5-yl]methyl]pyridinium bromide

A solution of 13.6 grams (0.044 mole) of 5-bromomethyl-4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole in 41 mL of pyridine was stirred at ambient temperature for three hours. After this time, the reaction mixture was slurried in 350 mL of diethyl ether and filtered. The filter cake was washed with additional diethyl ether. The filter cake was dried, yielding 11.9 grams of 1-[4-cyano-2-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-ylmethyl]pyridinium bromide. The nmr spectrum was consistent with the proposed structure.

Step F: N-[4-(Dimethylamino)phenyl]-a-[4-cyano-1- (3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]nitrone

To a stirred suspension of 9.0 grams (0.020 mole) of 1-[[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]methyl]pyridinium bromide and 3.5 grams (0.023 mole) of N,N-dimethyl-4-nitrosoaniline in 95 mL of ethanol was added a solution of 16 grams (0.12 mole) of potassium carbonate in 59 mL of water. When the addition was complete, the reaction mixture was stirred at ambient temperature for four hours. After this time, the reaction mixture was filtered. The filter cake was washed in succession with water, ethanol, and diethyl ether, yielding 7.6 grams of N-[4-(dimethylamino)phenyl]-a-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]nitrone. The nmr spectrum was consistent with the proposed structure.

Step G: 4--Cyano-5-formyl-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole

To a stirred suspension of 7.6 grams (0.02 mole) of N-[4-(dimethylamino)phenyl]-a-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]nitrone in 300 mL of ethyl acetate was added 400 mL of aqueous 6N hydrochloric acid, at which time all of the solid material dissolved. The aqueous layer was separated and extracted with one portion of ethyl acetate. An aqueous solution saturated with sodium chloride was added to the aqueous layer, and the mixture was extracted several more times with ethyl acetate. The ethyl acetate extracts were combined with the organic layer, and the combination was washed with water. The organic layer was dried with magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure to a residual oil. The oil was cooled and triturated with heptane, yielding 2.5 grams of 4-cyano-5-formyl-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole. The nmr spectrum was consistent with the proposed structure. (The compounds of Steps E, F, and G were prepared by the method of E. C. Taylor et al., J. Org. Chem., 43, 4, 736 (1978).)

Step H: 3-[5-Cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid

A stirred solution of 0.3 grams (0.001 mole) of 4-cyano-5-formyl-2-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazole, 0.2 gram (0.002 mole) of malonic acid, two drops of piperidine, and 3 mL of pyridine was heated at reflux for about 18 hours. After this time, the reaction mixture was cooled and was concentrated under reduced pressure to a residue. The residue was stirred with excess aqueous 2N hydrochloric acid and ethyl acetate. The organic layer was separated and washed with aqueous 2N hydrochloric acid and then with water. The organic layer was dried with magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure to a residue. The residue was triturated several times with petroleum ether, and each time the supernatent liquid was discarded. The resultant solid was dried, yielding 3-[4-cyano-2-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid. The nmr spectrum was consistent with the proposed structure and was identical to the nmr spectrum of this compound prepared by the method of Example 4.

EXAMPLE 6 Synthesis of Methyl 3-[4-Cyano-1-(2,3,5,6-Tetrafluoro-4-Trifluoromethylphenyl)-1H-Pyrazol-5-Yl]Acrylate (Compound 9)

Step A: Methyl 2-chloro-3-[4-cyano-1-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-1H-pyrazol-5-yl]propionate

This compound was prepared in a manner analogous to that of Example 1, Step A, with 4.0 grams of material that was about 50% (2.0 grams--0.006 mole) 5-amino-4-cyano-1-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-1H-pyrazole, 1.1 mL of tert-butyl nitrite, 0.7 gram of copper(II) chloride, and 13 mL of methyl acrylate in 13 mL of acetonitrile. The yield of methyl 2-chloro-3-[4-cyano-1-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)- 1H-pyrazol-5-yl]propionate was 3.8 grams. The nmr spectrum was consistent with the proposed structure.

Step B: Methyl 3-[4-cyano-1-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-1H-pyrazol-5-yl]acrylate

This compound was prepared in a manner analogous to that of Example 1, Step B, with 3.8 grams (0.009 mole) of methyl 2-chloro-3-[4-cyano-1-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-1H-pyrazol-5-yl]propionate, and 0.3 gram (0.012 mole) of sodium hydride in 70 ml of N,N-dimethylformamide. The yield of methyl 3-[4-cyano-1-(2,3,5,6-tetrafluoro-4-trifluoromethylphenyl)-1H-pyrazol-5-yl]acrylate was 1.7 grams. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 7 Synthesis of 3-[4-Cyano-1-(3-Chloro-5-Trifluoromethylpyridin-2-yl)-1H-Pyrazol-5-Yl]Acrylamide (Compound 41)

Step A: 3-[4-Cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid chloride

A stirred slurry of 1.1 grams (0.003 mole) of 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid and 1.0 mL of thionyl chloride in 20 mL of toluene was heated at about 72° C. for 25 minutes. The slurry was warmed to 98° C. over a 45 minutes period, during which time the reaction mixture became homogeneous. The reaction mixture was heated at 98° C. for 35 minutes. After this time, the reaction mixture was cooled and concentrated under reduced pressure, yielding 1.1 grams of 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid chloride. The acid chloride was used without purification.

Step B: 3-[4-Cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylamide

To a stirred, ice-cold solution of 10 mL (0.15 mole) of concentrated aqueous ammonia in 15 mL of tetrahydrofuran was added dropwise a solution of 0.35 gram (0.001 mole) of 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid chloride in 15 mL of tetrahydrofuran. Upon completion of the addition, the cooling bath was removed. The reaction vessel was closed by placing a rubber balloon over the open inlet of the reaction vessel. The reaction mixture was then allowed to warm to ambient temperature where it was stirred for one hour. After this time, the reaction mixture was concentrated at 45° C. under reduced pressure to a residual solid. The solid was triturated with petroleum ether and filtered, yielding a solid that did not completely melt at 212° C. The filtrate was concentrated in an air current, yielding a tan-yellow solid. Both solids were stirred in water separately. Each of the solids was then collected by filtration. The tan-yellow solid was triturated with two drops of isopropyl alcohol and petroleum ether. The suspension was cooled in a dry ice bath, and the solid was collected by filtration. The two solids were combined and dried, yielding 0.18 gram of 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]-acrylamide, m.p. 208°-210° C., dec. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 8 Synthesis of N,N-Dimethyl-3-[4-Cyano-1-(3-Chloro-5-Trifluoromethylpyridin-2-Yl)-1H-Pyrazol-5-Yl]-Acrylamide (Compound 48)

To a stirred solution of 0.5 gram (0.001 mole) of 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid chloride and 1.3 grams (0.012 mole) of triethylamine in 100 mL of tetrahydrofuran was added 1.0 gram (0.012 mole) of dimethylamine hydrochloride. Upon completion of the addition, the reaction was stirred at ambient temperature for about 18 hours. The reaction mixture was then warmed to 65° C. where it was stirred for 15 minutes. The reaction mixture was cooled and concentrated under reduced pressure to a residue. The residue was dissolved in ethyl acetate, and the solution was washed with water. The organic layer was treated with decolorizing carbon and dried with magnesium sulfate. The mixture was filtered, and the filtrate was concentrated under reduced pressure to a residue. The residue was triturated with petroleum ether, and a solid was collected by filtration, yielding 0.2 gram of N,N-dimethyl-3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylamide; m.p. 116°-120° C. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 9 Synthesis of Isopropylideneamino 3-[4-Cyano-1-(3-Chloro-5-Trifluoromethylpyridin-2-Yl)-1H-Pyrazol-5-Yl]Acrylate (Compound 28)

At 30° C. a solution of 0.6 gram (0.002 mole) of 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid chloride in 15 mL of tetrahydrofuran was added in portions to a stirred solution of 0.2 gram (0.002 mole) of acetone oxime, 0.3 gram (0.003 mole) of triethylamine, and a catalytic amount of 4-dimethylaminopyridine in 35 mL of toluene. Upon completion of the addition, the reaction mixture was stirred at 30° C. for five hours. After this time, the reaction mixture was diluted with water, and the pH was adjusted to about 3.0 with concentrated hydrochloric acid. The organic layer was separated and washed with an aqueous sodium chloride solution and then with water. The organic layer was concentrated under reduced pressure to a residual solid. The solid was subjected to column chromatography on silica gel with 1:1 hexane/ethyl acetate as eluant. Those fractions found by thin layer chromatography to contain a major constituent other than eluent and starting materials were combined and concentrated at 40° C. under reduced pressure, yielding 0.2 gram of isopropylideneamino 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylate. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 10 Synthesis of N-Phenylmethanesulfonyl-3-[4-Cyano-1-(3-Chloro-5-Trifluoromethylpyridin-2-Yl)-1H-Pyrazol-5-Yl]Yl]Acrylamide (Compound 67)

To a stirred solution of 0.31 gram (0.002 mole) of phenylmethanesulfonamide in 15 mL of tetrahydrofuran was added 0.05 gram (0.002 mole) of sodium hydride which was washed into the reaction vessel with 10 mL of tetrahydrofuran. The reaction mixture was warmed to reflux temperature, and a solution of 0.32 gram (0.001 mole) of 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid chloride in 5 mL of tetrahydrofuran was added dropwise during a 20 minute period. Upon completion of the addition, heating of the reaction mixture at reflux was continued for 75 minutes. After this time, the reaction mixture was cooled, and 1 mL of water was added. The mixture was concentrated under reduced pressure to a residue. The residue was dissolved in 35 mL of water, and the solution was acidified with aqueous 4N hydrochloric acid. The resultant solid was collected by filtration, and the filter cake was washed with water. The filter cake was then stirred with hot water. The hot water was decanted away from a semi-solid material. The semi-solid was stirred with fresh cold water which caused the semi-solid to totally solidify. The solid was collected by filtration and was then dissolved in 1:1 toluene/ethyl acetate. The solution was passed through a column of silica gel. The eluate was concentrated under reduced pressure, yielding 0.13 gram of N-phenylmethanesulfonyl-3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylamide. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 11 Synthesis of Methoxycarbonylmethyl 3-[4-Cyano-1-(3-Chloro-5-Trifluoromethylpyridin-2-Yl)-1H-Pyrazol-5-Yl]Acrylate (Compound 30)

This compound was prepared in a manner analogous to that of Example 8, with 0.5 gram (0.0014 mole) of 3-[4-cyano- 1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid chloride, 0.2 gram (0.0017 mole) of methyl glycolate, and 0.2 gram (0.0020 mole) of triethylamine in 25 mL of tetrahydrofuran. The yield of methoxycarbonylmethyl 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylate was 0.1 gram. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 12 Synthesis of 1,1-Dimethylethoxycarbonylmethyl 3-[4-Cyano-1-(3-Chloro-5-Trifluoromethylpyridin-2-Yl)-1H-Pyrazol-5-Yl]Acrylate (Compound 33)

To a stirred solution of 0.4 gram (0.001 mole) of 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylic acid in 25 mL of acetone were added in succession 0.2 gram (0.001 mole) of potassium carbonate and 0.2 gram (0.001 mole) of 1,1-dimethylethyl bromoacetate. Upon completion of the addition, the reaction mixture was stirred at 25° C. for 25 minutes, and then it was heated to reflux where it was stirred for one hour. After this time, the reaction mixture was cooled and concentrated under reduced pressure to a residue. The residue was shaken with methylene chloride and water. The organic layer was washed with water and then dried with calcium sulfate. The mixture was filtered through silica gel. The silica gel filter pad was washed with petroleum ether. The combined filtrates were concentrated under reduced pressure, yielding 0.5 gram of 1,1-dimethylethoxycarbonylmethyl 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylate; m.p. 110°-112 ° C. The nmr spectrum was consistent with the proposed structure.

EXAMPLE 13 Synthesis of Carboxymethyl 3-[4-Cyano-1-(3-Chloro-5-Trifluoromethylpyridin-2-Yl)-1H-Pyrazol-5-Yl]Acrylate (Compound 29)

A solution of 0.33 gram (0.0007 mole) of 1,1-dimethylethoxycarbonylmethyl 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylate in 1.3 mL of trifluoroacetic acid was stirred at ambient temperature for one hour. After this time, the reaction mixture was concentrated under reduced pressure at a temperature of about 30° to 50° C. The resultant residue was taken up in toluene, and the concentration procedure was repeated. The residue was shaken with diethyl ether and water and then concentrated under reduced pressure at a temperature of about 45° C., yielding 0.29 gram of 90% pure carboxymethyl 3-[4-cyano-1-(3-chloro-5-trifluoromethylpyridin-2-yl)-1H-pyrazol-5-yl]acrylate. The nmr spectrum was consistent with the proposed structure.

Representative compounds of the invention prepared by the methods exemplified above are shown in Table 1.

Characterizing properties of these compounds are given in Table 2.

HERBICIDAL ACTIVITY

The B-pyrazolylacrylic acids of this invention were tested in pre- and postemergence evaluations using a variety of broadleaf and grasseous crops and weeds. The test species used in demonstrating the herbicidal activity of this invention include cotton (Gossypium hirsutum var. DPL61) soybean (Glycine max var. Williams), field corn (Zea mays var. Agway 425X), rice (Oryza sativa var. Labelle), wheat (Triticum aestivum var. Wheaton), morningglory (Ipomea lacunosa or Ipomea hederacea), wild mustard (Brassica kaber), velvetleaf (Abutilon theophrasti), barnyardgrass (Echinochloa crus-galli), green foxtail (Setaria viridis), johnsongrass (Sorghum halepense), blackgrass (Alopecurus myosuroides), common chickweed (Stellaria media), and common cocklebur (Xanthium pennsylvanicum).

PREPARATION OF FLATS Preemergence

Two disposable fiber flats (8 cm×15 cm×25 cm) for each rate of application for each candidate herbicide are filled to an approximate depth of 6.5 cm with steam-sterilized sandy loam soil. The soil is leveled and impressed with a template to provide five or six evenly spaced furrows 13 cm long and 0.5 cm deep in each flat.

In one case, seeds of cotton, soybean, corn, rice, and wheat are planted in the furrows of the first flat, and seeds of morningglory, wild mustard, velvetleaf, barnyardgrass, green foxtail, and johnsongrass are planted in the furrows of the second flat. The six-row template was employed to firmly press the seeds into place. A topping soil of equal portions of sand and sandy loam soil is placed uniformly on top of each flat to a depth of approximately 0.5 cm.

In another case, seeds of soybean, wheat, corn, green foxtail, and johnsongrass are planted in the furrows of the first flat, and seeds of velvetleaf, morningglory, common chickweed, cocklebur, and blackgrass are planted in the furrows of the second flat. The five-row template is employed to firmly press the seeds into place. A topping soil of equal portions of sand and sandy loam soil is placed uniformly on top of each flat to a depth of approximately 0.5 cm.

In each case, the flats are first watered, then sprayed with a solution of test compound as described below.

Postemergence

Two flats for each rate of application for each herbicide candidate are also prepared for postemergence application. The postemergence flats are prepared in the same manner as discussed above for the preemergence flats. The prepared flats are watered for 8-11 days, then the foliage of the emerged tests plants is sprayed with a solution of test compound as described below.

Application of Herbicides

In both the preemergence and postemergence tests, the candidate herbicides are applied as aqueous acetone solutions, usually at rates equivalent to 8.0 kilograms/hectare (kg/ha) and/or submultiples thereof, i.e., 4.0 kg/ha, 2.0 kg/ha, and so on.

The four flats (2 preemergence, 2 postemergence) are placed together and sprayed with 30 mL of test solution containing an appropriate amount of the test compound, i.e., approximately 7.5 mL of the test solution is sprayed on each of the four flats. Preemergence applications are made as sprays to the soil surface. Postemergence applications are made as sprays to the foliage. After treatment, the two preemergence flats are watered regularly at the soil surface for approximately 2 weeks, at which time phytotoxicity data are recorded. In the postemergence test the foliage is kept dry for 24 hours after treatment, then watered regularly for approximately 2 weeks, and phytotoxicity data recorded.

PREPARATION OF TEST SOLUTIONS

For flats of the size described above, an application rate of 8.0 kg/ha of active ingredient is equivalent to 0.06 g of active ingredient/flat (0.24 g for the four flats). A stock solution of 0.48 g of the candidate herbicide in 60 mL of a 50:50 mixture of water and acetone containing 0.5% (v/v) of sorbitan monolaurate emulsifier/solubilizer is divided into two 30 mL portions, each containing 0.24 g of the candidate herbicide. For the 8.0 kg/ha application, one of the 30 mL portions is sprayed undiluted onto the four flats (7.5 mL/flat). The remaining 30 mL portion of the stock solution is diluted with an additional 30 mL of the aqueous acetone/emulsifier mixture to provide 60 mL of a solution containing 0.24 g of candidate herbicide. As above, this solution is divided into two 30 mL portions, each containing 0.12 g of candidate herbicide. One of the 30 mL portions is applied, without further dilution, to the four flats for the 4.0 kg/ha rate. The remaining 30 mL portion is further diluted with an equal amount of aqueous acetone/emulsifier mixture, and the resulting 60 mL solution of 0.12 g candidate herbicide is divided into two 30 mL portions each containing 0.06 g of candidate herbicide. One of the 30 mL (0.06 g active) portions is used for the 2.0 kg/ha application rate and the other is used in the preparation of lower rate test solutions by the same serial dilution technique.

Phytotoxicity data are taken as percent control. Percent control is determined by a method similar to the 0 to 100 rating system disclosed in "Research Methods in Weed Science," 2nd ed., B. Truelove, Ed.; Southern Weed Science Society; Auburn University, Auburn, Ala., 1977. The rating system is as follows:

    ______________________________________                                         Herbicide Rating System                                                        Rating  Description                                                            Percent of Main    Crop         Weed                                           Control Categories Description  Description                                    ______________________________________                                          0      No effect  No crop      No weed                                                           reduction    control                                                           or injury                                                   10                 Slight dis-  Very poor weed                                                    coloration   control                                                           or stunting                                                 20      Slight     Some dis-    Poor weed                                              effect     coloration,  control                                                           stunting or                                                                    stand loss                                                  30                 Crop injury  Poor to defi-                                                     more pronounced                                                                             cient weed                                                        but not lasting                                                                             control                                        40                 Moderate injury,                                                                            Deficient weed                                                    crop usually control                                                           recovers                                                    50      Moderate   Crop injury  Deficient to                                           effect     more lasting,                                                                               moderate weed                                                     recovery doubtful                                                                           control                                        60                 Lasting crop Moderate weed                                                     injury, no   control                                                           recovery                                                    70                 Heavy injury and                                                                            Control some-                                                     stand loss   what less than                                                                 satisfactory                                   80      Severe     Crop nearly de-                                                                             Satisfactory                                                      stroyed, a few                                                                              to good weed                                                      survivors    control                                        90                 Only occasional                                                                             Very good to                                                      live plants left                                                                            excellent                                                                      control                                        100     Complete   Complete crop                                                                               Complete weed                                          effect     destruction  destruction                                    ______________________________________                                    

For herbicidal application, the active compounds are formulated into herbicidal compositions by admixture in herbicidally effective amounts with adjuvants and carriers normally employed in the art for facilitating the dispersion of active ingredients for the particular utility desired, recognizing the fact that the formulation and mode of application of a toxicant may affect the activity of the material in a given application. Thus, for agricultural use the present herbicidal compounds may be formulated as granules of relatively large particle size, as water-soluble or water-dispersible granules, as powdery dusts, as wettable powders, as emulsifiable concentrates, as solutions, or as any of several other known types of formulations, depending on the desired mode of application.

These herbicidal compositions may be applied either as water-diluted sprays, or dusts, or granules to the areas in which suppression of vegetation is desired. These formulations may contain as little as 0.1%, 0.2% or 0.5% to as much as 95% or more by weight of active ingredient.

Dusts are free flowing admixtures of the active ingredient with finely divided solids such as talc, natural clays, kieselguhr, flours such as walnut shell and cottonseed flours, and other organic and inorganic solids which act as dispersants and carriers for the toxicant; these finely divided solids have an average particle size of less than about 50 microns. A typical dust formulation useful herein is one containing 1.0 part or less of the herbicidal compound and 99.0 parts of talc.

Wettable powders, also useful formulations for both pre- and postemergence herbicides, are in the form of finely divided particles which disperse readily in water or other dispersant. The wettable powder is ultimately applied to the soil either as a dry dust or as an emulsion in water or other liquid. Typical carriers for wettable powders include Fuller's earth, kaolin clays, silicas, and other highly absorbent, readily wet inorganic diluents Wettable powders normally are prepared to contain about 5-80% of active ingredient, depending on the absorbency of the carrier, and usually also contain a small amount of a wetting, dispersing or emulsifying agent to facilitate dispersion. For example, a useful wettable powder formulation contains 80.8 parts of the herbicidal compound, 17.9 parts of Palmetto clay, and 1.0 part of sodium lignosulfonate and 0.3 part of sulfonated aliphatic polyester as wetting agents. Frequently additional wetting agent and/or oil will be added to the tank mix for postemergence application to facilitate dispersion on the foliage and absorption by the plant.

Other useful formulations for herbicidal applications are emulsifiable concentrates (ECs) which are homogeneous liquid compositions dispersible in water or other dispersant, and may consist entirely of the herbicidal compound and a liquid or solid emulsifying agent, or may also contain a liquid carrier, such as xylene, heavy aromatic naphthas, isophorone, or other non-volatile organic solvent. For herbicidal application these concentrates are dispersed in water or other liquid carrier, and normally applied as a spray to the area to be treated. The percentage by weight of the essential active ingredient may vary according to the manner in which the composition is to be applied, but in general comprises 0.5 to 95% of active ingredient by weight of the herbicidal composition.

Flowable formulations are similar to ECs except that the active ingredient is suspended in a liquid carrier, generally water. Flowables, like ECs, may include a small amount of a surfactant, and contain active ingredient in the range of 0.5 to 95%, frequently from 10 to 50%, by weight of the composition. For application, flowables may be diluted in water or other liquid vehicle, and are normally applied as a spray to the area to be treated.

Typical wetting, dispersing or emulsifying agents used in agricultural formulations include, but are not limited to, the alkyl and alkylaryl sulfonates and sulfates and their sodium salts; alkylaryl polyether alcohols; sulfated higher alcohols; polyethylene oxides; sulfonated animal and vegetable oils; sulfonated petroleum oils; fatty acid esters of polyhydric alcohols and the ethylene oxide addition products of such esters; and the addition product of long-chain mercaptans and ethylene oxide. Many other types of useful surface-active agents are available in commerce. The surface-active agent, when used, normally comprises from 1 to 15% by weight of the composition.

Other useful formulations include suspensions of the active ingredient in a relatively non-volatile solvent such as water, corn oil, kerosene, propylene glycol, or other suitable solvents.

Still other useful formulations for herbicidal applications include simple solutions of the active ingredient in a solvent in which it is completely soluble at the desired concentration, such as acetone, alkylated naphthalenes, xylene, or other organic solvents. Granular formulations, wherein the toxicant is carried on relatively coarse particles, are of particular utility for aerial distribution or for penetration of cover crop canopy. Pressurized sprays, typically aerosols wherein the active ingredient is dispersed in finely divided form as a result of vaporization of a low boiling dispersant solvent carrier, such as the Freon fluorinated hydrocarbons, may also be used. Water-soluble or water-dispersible granules are also useful formulations for herbicidal application of the present compounds. Such granular formulations are free-flowing, non-dusty, and readily water-soluble or water-miscible. The soluble or dispersible granular formulations described in U.S. Pat. No. 3,920,442 are useful herein with the present herbicidal compounds. In use by the farmer on the field, the granular formulations, emulsifiable concentrates, flowable concentrates, solutions, etc., may be diluted with water to give a concentration of active ingredient in the range of say 0.1% or 0.2% to 1.5% or 2%.

The active herbicidal compounds of this invention may be formulated and/or applied with insecticides, fungicides, nematicides, plant growth regulators, fertilizers, or other agricultural chemicals and may be used as effective soil sterilants as well as selective herbicides in agriculture. In applying an active compound of this invention, whether formulated alone or with other agricultural chemicals, an effective amount and concentration of the active compound is of course employed; the amount may be as low as, e.g. about 1 to 250 g/ha, preferably about 4 to 30 g/ha. For field use, where there are losses of herbicide, higher application rates (e.g., four times the rates mentioned above) may be employed.

The active herbicidal compounds of this invention may be used in combination with other herbicides, e.g. they may be mixed with, say, an equal or larger amount of a known herbicide such as chloroacetanilide herbicides such as 2-chloro-N-(2,6-diethylphenyl)-N-(methoxymethyl)acetamide (alachlor), 2-chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl)acetamide (metolachlor), and N-chloroacetyl-N-(2,6-diethylphenyl)glycine (diethatyl-ethyl); benzothiadiazinone herbicides such as 3-(1-methylethyl)-(1H)-2,1,3-benzothiadiazin-4-(3H)-one-2,2-dioxide (bentazon); triazine herbicides such as 6-chloro-N-ethyl-N-(1-methylethyl)1,3,5-triazine-2,4-diamine (atrazine), and 2-[4-chloro6-(ethylamino)-1,3,5-triazin-2-yl]amino-2-methylpropanenitrile (cyanazine); dinitroaniline herbicides such as 2,6-dinitro-N,N-dipropyl-4-(trifluoromethyl)benzeneamine (trifluralin); aryl urea herbicides such as N,-(3,4-dichlorophenyl)-N,N-dimethylurea (diuron) and N,N-dimethyl-N,-[3-(trifluoromethyl)phenyl]urea (fluometuron); and 2-[(2-chlorophenyl)methyl]-4,4-dimethyl-3-isoxazolidinone.

It is apparent that various modifications may be made in the formulation and application of the compounds of this invention without departing from the inventive concepts herein as defined in the claims.

                                      TABLE 1                                      __________________________________________________________________________      ##STR17##                                                                      ##STR18##                                                                     __________________________________________________________________________     Compound                                                                             X  X.sup.1                                                                           X.sup.2                                                                            X.sup.3     M   R.sup.2                                                                            Z    n  R.sup.3        R.sup.4             __________________________________________________________________________      1    Cl H  CF.sub.3                                                                           H           CH  H   O    0  H                                   2    Cl H  CF.sub.3                                                                           H           CH  H   O    0  CH.sub.3                            3    Cl H  CF.sub.3                                                                           H           CH  H   O    0  CH.sub.2 CO.sub.2 CH.sub.3          4    Cl Cl Cl  H           CH  H   O    0  H                                   5    Cl Cl Cl  H           CH  H   O    0  CH.sub.3                            6    Cl Cl Cl  H           CH  H   O    0  C.sub.2 H.sub.5                     7    Cl Cl Cl  H           CH  H   O    0  CH.sub.2 CO.sub.2 CH.sub.3          8    F  F  F   F           CF  H   O    0  CH.sub.3                            9    F  F  CF.sub.3                                                                           F           CF  H   O    0  CH.sub.3                           10    F  F  OC.sub.2 H.sub.5                                                                   F           CF  H   O    0  H                                  11    F  F  OC.sub.2 H.sub.5                                                                   F           CF  H   O    0  CH.sub.3                           12    Cl H  Cl  H           N   H   O    0  H                                  13    Cl H  Cl  H           N   H   O    0  CH.sub.3                           14    Cl H  CF.sub.3                                                                           H           N   H   O    0  H                                  15    Cl H  CF.sub.3                                                                           H           N   H   O    0  Na.sup.+                           16    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH.sub.3                           17    Cl H  CF.sub.3                                                                           H           N   H   O    0  C.sub.2 H.sub.5                    18    Cl H  CF.sub.3                                                                           H           N   CH.sub.3                                                                           O    0  CH.sub.3                           19    Cl H  CF.sub.3                                                                           Cl          N   H   O    0  H                                  20    Cl H  CF.sub.3                                                                           Cl          N   H   O    0  CH.sub.3                           21    Cl H  CF.sub.3                                                                           N(CH.sub.3)CH.sub.2 CCH                                                                    N   H   O    0  H                                  22    Cl H  CF.sub.3                                                                           N(CH.sub.3)CH.sub.2 CCH                                                                    N   H   O    0  CH.sub.3                           23    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH.sub.2 CCH                       24    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH.sub.2 CN                        25    Cl H  CF.sub.3                                                                           H           N   H   O    0                                                                                  ##STR19##                         26    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH.sub.2 φ                     27    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH.sub.2 φ, 4-SCH.sub.3        28    Cl H  CF.sub.3                                                                           H           N   H   O    0  NC(CH.sub.3).sub.2                 29    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH.sub.2 CO.sub.2 H                30    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH.sub.2 CO.sub.2 CH.sub.3         31    Cl H  CF.sub.3                                                                           H           N   H   S    0  CH.sub.2 CO.sub.2 CH.sub.3         32    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH.sub.2 CO.sub.2 C.sub.2                                                      H.sub.5                            33    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH.sub.2 CO.sub.2 C(CH.sub.3).                                                 sub.3                              34    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH(CH.sub.3)CO.sub.2 H             35    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH(CH.sub.3)CO.sub.2 CH.sub.3      36    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH(CH.sub.3)CO.sub.2 C(CH.sub.                                                 3).sub.3                           37    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH.sub.2 C(O)NH.sub.2              38    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH(CH.sub.3)C(O)NH.sub.2           39    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH(CH.sub.3)C(O)N(CH.sub.3).su                                                 b.2                                40    Cl H  CF.sub.3                                                                           H           N   H   O    0  CH(CH.sub.3)C(O)NHS(O).sub.2                                                   CH.sub.3                           41    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            0  H              H                   42    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            0  CH.sub.3       H                   43    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            0  CH(CH.sub.3)C.sub.2 H.sub.5                                                                   H                   44    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            0  CH.sub.2 CO.sub.2 C.sub.2                                                      H.sub.5        H                   45    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            0  C(CH.sub.3).sub.2 CN                                                                          H                   46    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            0  φ          H                   47    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            0  CH.sub.2 φ H                   48    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            0  CH.sub.3       CH.sub.3            49    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            0  OCH.sub.3      CH.sub.3            50    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            0  CH.sub.2 CH.sub.2 OCH.sub.2                                                    CH.sub.2                           51    Cl H  CF.sub.3                                                                           H           CH  H   NR.sup.4                                                                            1  CH.sub.2 φ H                   52    Cl Cl Cl  H           CH  H   NR.sup.4                                                                            1  CH.sub.2 φ H                   53    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.3       H                   54    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.3       Na.sup.+            55    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  C.sub.2 H.sub.5                                                                               H                   56    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  C.sub.3 H.sub.7                                                                               H                   57    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH(CH.sub.3).sub.2                                                                            H                   58    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH(CH.sub.3).sub.2                                                                            Na.sup.+            59    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 CH(CH.sub.3).sub.2                                                                   H                   60    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH(CH.sub.3                                                                                   HC.sub.2 H.sub.     61    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1                                                                                  ##STR20##     H                   62    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CF.sub.3       H                   63    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  NH.sub.2       H                   64    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  φ          H                   65    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  φ, 2-Cl    H                   66    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  φ, 4-CH.sub.3                                                                             H                   67    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 φ H                   68    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 φ Na.sup.+            69    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 φ,                                                                               H-Cl                70    Cl H  CF.sub.3                                                                           H           N   H   NR.sup. 4                                                                           1  CH.sub.2 φ,                                                                               H-Cl                71    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 φ,                                                                               H-Cl                72    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 φ,                                                                               H-F                 73    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 φ,                                                                               H-Br                74    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 φ,                                                                               H,4-Cl.sub.2        75    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 φ,                                                                               H-CH.sub.3          76    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 φ,                                                                               H-CH.sub.3          77    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CH.sub.2 CH.sub.2 φ                                                                       H                   78    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1  CHCHφ      H                   79    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1                                                                                  ##STR21##     H                   80    Cl H  CF.sub.3                                                                           H           N   H   NR.sup.4                                                                            1                                                                                  ##STR22##     H                   __________________________________________________________________________

                  TABLE 2                                                          ______________________________________                                         Characterizing Properties                                                      Compound                                                                       No.                M.P. (°C.)                                           ______________________________________                                          1                 74-177                                                       2                 113-114                                                      3                 clear oil                                                    4                 226.5-228.5                                                  5                 180.5-181.5                                                  6                 131-134                                                      7                 solid                                                        8                 solid                                                        9                 viscous oil                                                 10                 waxy solid                                                  11                 oil                                                         12                 217-219                                                     13                 116.5-168                                                   14                 225-228                                                     15                 solid                                                       16                 waxy solid                                                  17                 98-101                                                      18                 solid                                                       19                 solid                                                       20                 solid                                                       21                 solid                                                       22                 115-117.5                                                   23                 glassy material                                             24                 oil                                                         25                 166-168                                                     26                 97-99.5                                                     27                 solid                                                       28                 solid                                                       29                 foamy solid                                                 30                 oil                                                         31                 oil                                                         32                 viscous oil                                                 33                 110-112                                                     34                 solid                                                       35                 viscous fluid                                               36                 120-122                                                     37                 solid                                                       38                 solid                                                       39                 solid                                                       40                 solid                                                       41                 208-210; dec.                                               42                 208.5-210                                                   43                 146-148                                                     44                 viscous liquid                                              45                 194-197                                                     46                 204-207                                                     47                 125-129                                                     48                 116-120                                                     49                 solid                                                       50                 146-149; dec                                                51                 solid                                                       52                 solid                                                       53                 solid                                                       54                 solid                                                       55                 158-162                                                     56                 solid                                                       57                 solid                                                       58                 solid                                                       59                 solid                                                       60                 solid                                                       61                 100; dec                                                    62                 168-170                                                     63                 solid                                                       64                 158-160; dec                                                65                 solid                                                       66                 solid                                                       67                 solid                                                       68                 solid                                                       69                 solid                                                       70                 solid                                                       71                 solid                                                       72                 solid                                                       73                 solid                                                       74                 solid                                                       75                 solid                                                       76                 solid                                                       77                 solid                                                       78                 solid                                                       79                 102-106                                                     80                 solid                                                       ______________________________________                                    

                                      TABLE 3                                      __________________________________________________________________________     PREEMERGENCE HERBICIDAL ACTIVITY (% Control)                                   __________________________________________________________________________             Compound No.                                                                   1  2  3  4  5  6  7  8 9  10 11 12 13 14 15 16                                 Rate (kg/ha)                                                                   0.5                                                                               0.5                                                                               0.5                                                                               1.0                                                                               0.5                                                                               1.0                                                                               0.5                                                                               0.5                                                                              0.5                                                                               0.5                                                                               0.5                                                                               1.0                                                                               1.0                                                                               1.0                                                                               1.0                                                                               1.0                        __________________________________________________________________________     Cotton  40 80 20 20 70 40 70 0 30 70 30 10 5  90 90 90                         Soybean 95 100                                                                               95 50 15 5  10 0 0  0  30 95 15 100                                                                               100                                                                               100                        Corn    95 90 85 60 15 5  70 20                                                                               50 70 50 85 80 100                                                                               100                                                                               100                        Rice    80 70 20 60 15 10 40 10                                                                               50 15 10 10 5  60 85 95                         Wheat   95 9  90 70 15 50 70 0 10 0  0  20 20 90 95 95                         Morningglory                                                                           95 100                                                                               100                                                                               80 85 100                                                                               80 30                                                                               70 80 80 60 20 100                                                                               95 100                        Wild mustard                                                                           100                                                                               100                                                                               100                                                                               100                                                                               70 100                                                                               100                                                                               0 100                                                                               70 50 85 95 100                                                                               100                                                                               100                        Velvetleaf                                                                             100                                                                               100                                                                               100                                                                               95 90 100                                                                               90 5 100                                                                               100                                                                               100                                                                               80 20 100                                                                               90 100                        Barnyardgrass                                                                          70 90 70 5  20 90 85 70                                                                               70 15 40 85 60 90 95 100                        Green foxtail                                                                          30 95 20 80 30 100                                                                               30 70                                                                               100                                                                               0  0  10 50 100                                                                               100                                                                               100                        Johnsongrass                                                                           85 95 100                                                                               85 85 90 95 0 90 70 50 95 90 100                                                                               100                                                                               100                                Compound No.                                                                   17 18 19 20                                                                               21 22 23 24 25 26 27 28 29 30 31 32                                 Rate (kg/ha)                                                                   1.0                                                                               1.0                                                                               1.0                                                                               1.0                                                                              1.0                                                                               1.0                                                                               1.0                                                                               0.5                                                                               0.5                                                                               1.0                                                                               0.5                                                                               0.5                                                                               1.0                                                                               0.5                                                                               0.5                                                                               0.5                        __________________________________________________________________________     Cotton  70 5  20 5 0  10 90 5  40 40 5  10 90 20 30 100                        Soybean 100                                                                               40 20 5 95 70 100                                                                               95 95 95 95 95 100                                                                               100                                                                               95 100                        Corn    100                                                                               95 50 20                                                                               5  5  100                                                                               100                                                                               95 90 90 95 100                                                                               100                                                                               100                                                                               95                         Rice    80 60 10 20                                                                               0  5  70 30 80 70 15 90 95 90 90 80                         Wheat   90 80 30 0 5  10 80 50 85 85 50 85 95 90 90 90                         Morningglory                                                                           100                                                                               95 70 10                                                                               15 70 100                                                                               100                                                                               100                                                                               100                                                                               95 100                                                                               100                                                                               100                                                                               100                                                                               100                        Wild mustard                                                                           100                                                                               100                                                                               100                                                                               85                                                                               50 100                                                                               100                                                                               90 100                                                                               100                                                                               95 100                                                                               100                                                                               100                                                                               100                                                                               100                        Velvetleaf                                                                             100                                                                               100                                                                               80 90                                                                               10 15 100                                                                               100                                                                               100                                                                               100                                                                               10 100                                                                               100                                                                               100                                                                               100                                                                               100                        Barnyardgrass                                                                          95 95 0  30                                                                               0  10 100                                                                               100                                                                               100                                                                               70 50 100                                                                               100                                                                               100                                                                               95 95                         Green foxtail                                                                          100                                                                               100                                                                               30 95                                                                               5  5  100                                                                               95 100                                                                               70 5  90 100                                                                               90 95 100                        Johnsongrass                                                                           100                                                                               95 60 60                                                                               10 40 100                                                                               100                                                                               100                                                                               100                                                                               95 100                                                                               100                                                                               100                                                                               95 95                                 Compound No.                                                                   33 34 35 36 37 38 39 40 41 42 43 44 45 46 47                                                                               48                                 Rate (kg/ha)                                                                   1.0                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               1.0                                                                               1.0                                                                               1.0                                                                               0.5                                                                               0.5                                                                               0.5                                                                               2.0                                                                              1.0                        __________________________________________________________________________     Cotton  15 50 80 5  80 95 50 50 80 89 80 20 70 0    80                         Soybean 50 100                                                                               100                                                                               85 100                                                                               100                                                                               90 85 100                                                                               95 80 90 90 5  5 95                         Corn    90 100                                                                               95 80 95 95 95 90 100                                                                               100                                                                               95 95 70 10 90                                                                               100                        Rice    60 70 95 20 70 90 85 60 95 100                                                                               70 70 15 0    100                        Wheat   60 85 90 50 95 90 95 50 100                                                                               100                                                                               95 50 40 10 40                                                                               100                        Morningglory                                                                           95 95 100                                                                               85 95 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95 95 100                                                                               20 80                                                                               100                        Wild mustard                                                                           100                                                                               100                                                                               100                                                                               85 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95 100                                                                               95   100                        Velvetleaf                                                                             90 90 100                                                                               15 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               60 90                                                                               100                        Barnyardgrass                                                                          100                                                                               100                                                                               95 60 80 100                                                                               100                                                                               95 100                                                                               100                                                                               100                                                                               95 15 0    100                        Green foxtail                                                                          70 95 70 0  85 80 100                                                                               85 100                                                                               100                                                                               200                                                                               80 100                                                                               40 70                                                                               100                        Johnsongrass                                                                           95 100                                                                               95 95 95 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               90 40 85                                                                               100                        Blackgrass                                        70                           Chickweed                                         0                            Cocklebur                                         0                                    Compound No.                                                                   49 50 51 52                                                                               53 54 55 56 57 58 59 60 61 62 63 64                                 Rate (kg/ha)                                                                   0.5                                                                               0.5                                                                               0.25                                                                              0.5                                                                              1.0                                                                               1.0                                                                               0.5                                                                               0.5                                                                               1.0                                                                               1.0                                                                               0.5                                                                               0.5                                                                               0.5                                                                               1.0                                                                               0.5                                                                               0.5                        __________________________________________________________________________     Cotton  60 85    30                                                                               90 90 95 15 90 100                                                                               85 10 40 10 50 80                         Soybean 80 5  0  0 100                                                                               95 100                                                                               100                                                                               100                                                                               100                                                                               85 90 85 80 90 90                         Corn    100                                                                               95 15 0 100                                                                               90 100                                                                               100                                                                               100                                                                               100                                                                               80 60 90 100                                                                               95 40                         Rice    80 85    0 95 70 90 40 90 100                                                                               70 5  5  50 95 70                         Wheat   90 95 0  5 90 90 90 70 100                                                                               95 50 10 40 85 95 20                         Morningglory                                                                           90 100                                                                               80 95                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95                         Wild mustard                                                                           100                                                                               100   95                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                        Velvetleaf                                                                             100                                                                               100                                                                               15 90                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                        Barnyardgrass                                                                          100                                                                               100   0 100                                                                               90 100                                                                               100                                                                               100                                                                               100                                                                               70 50 30 95 95 50                         Green foxtail                                                                          100                                                                               100                                                                               15 0 100                                                                               90 100                                                                               100                                                                               100                                                                               100                                                                               85 90 20 60 100                                                                               100                        Johnsongrass                                                                           100                                                                               100                                                                               15 10                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               10 80 95 95 95                         Blackgrass    5                                                                Chickweed     10                                                               Cocklebur     20                                                                       Compound No.                                                                   65 66 67 68 69 70 71 72 73 74 75 76 77 78 79                                                                               80                                 Rate (kg/ha)                                                                   0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                              0.5                        __________________________________________________________________________     Cotton  15 5  95 85 95 80 70 65          90    50 40                                                                               95                         Soybean 85 50 95 60 80 70 30 90 80 30 95 90 30 95 90                                                                               95                         Corn    90 50 95 40 40 20 50 90 40 10 40 90 55 60 95                                                                               95                         Rice    20 5  30 70 40 40 15 15          90    0  90                           Wheat   15 10 70 50 10 10 10 50 30 5  45 15 20 20 60                                                                               40                         Morningglory                                                                           95 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95 100                                                                               100                                                                               100                                                                               100                                                                               95                                                                               100                        Wild mustard                                                                           100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100         100   100                                                                               90                           Velvetleaf                                                                             90 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95                                                                               100                        Barnyardgrass                                                                          30 70 80 50 50 30 40 85          80    50 50                           Green foxtail                                                                          85 90 100                                                                               95 90 20 95 100                                                                               95 15 95 95 85 0  0 75                         Johnsongrass                                                                           95 95 100                                                                               95 90 50 95 100                                                                               95 70 90 100                                                                               85 100                                                                               90                                                                               95                         Blackgrass                      20 20 40    65      70                         Chickweed                       100                                                                               100                                                                               100   95      30                         Cocklebur                       95 85 100   95                                 __________________________________________________________________________

                                      TABLE 4                                      __________________________________________________________________________     POSTEMERGENCE HERBICIDAL ACTIVITY (% Control)                                  __________________________________________________________________________             Compound No.                                                                   1  2  3  4  5  6  7  8  9  10 11 12 13 14 15 16                                Rate (kg/ha)                                                                   0.5                                                                               0.5                                                                               0.5                                                                               1.0                                                                               0.5                                                                               1.0                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               1.0                                                                               1.0                                                                               1.0                                                                               1.0                                                                               1.0                       __________________________________________________________________________     Cotton  90 100                                                                               80 100                                                                               95 100                                                                               100                                                                               60 95 90 100                                                                               50 40 100                                                                               100                                                                               100                       Soybean 90 95 95 80 80 40 90 30 70 40 40 95 70 100                                                                               100                                                                               100                       Corn    90 95 95 90 100                                                                               85 100                                                                               50 70 95 80 95 90 100                                                                               100                                                                               95                        Rice    20 30 60 70 5  20 40 5  60 15 40 15 5  70 85 95                        Wheat   95 95 70 90 50 60 70 10 40 10 10 15 30 100                                                                               95 100                       Morningglory                                                                           100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95 100                                                                               70 100                                                                               100                                                                               100                                                                               100                                                                               50 100                                                                               100                                                                               100                       Wild mustard                                                                           100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               10 90 80 95 100                                                                               100                                                                               100                                                                               100                                                                               100                       Velvetleaf                                                                             80 100                                                                               100                                                                               90 100                                                                               100                                                                               100                                                                               95 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95                        Barnyardgrass                                                                          50 70 60 95 50 50 50 60 70 30 40 60 40 100                                                                               100                                                                               100                       Green foxtail                                                                          20 50 90 90 5  40 20 40 100                                                                               90 10 60 5  100                                                                               100                                                                               100                       Johnsongrass                                                                           80 90 85 95 85 95 100                                                                               40 95 70 60 60 50 100                                                                               100                                                                               85                                Compound No.                                                                   17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32                                Rate (kg/ha)                                                                   1.0                                                                               1.0                                                                               1.0                                                                               1.0                                                                               1.0                                                                               1.0                                                                               1.0                                                                               0.5                                                                               0.5                                                                               1.0                                                                               0.5                                                                               0.5                                                                               1.0                                                                               0.5                                                                               0.5                                                                               0.5                       __________________________________________________________________________     Cotton  100                                                                               100                                                                               100                                                                               70 80 95 100                                                                               100                                                                               90 60 90 100                                                                               95 100                                                                               95 100                       Soybean 95 60 70 40 85 95 95 95 100                                                                               95 95 100                                                                               95 100                                                                               100                                                                               100                       Corn    95 90 90 40 90 80 100                                                                               100                                                                               100                                                                               100                                                                               95 95 100                                                                               95 95 100                       Rice    50 40 30 15 30 20 30 50 70 40 10 70 50 70 70 100                       Wheat   85 60 90 20 40 40 95 70 95 85 30 90 95 90 70 100                       Morningglory                                                                           100                                                                               100                                                                               100                                                                               60 30 50 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                       Wild mustard                                                                           100                                                                               100                                                                               100                                                                               40 100                                                                               95 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                       Velvetleaf                                                                             100                                                                               100                                                                               100                                                                               95 15 80 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                       Barnyardgrass                                                                          100                                                                               70 100                                                                               70 40 50 100                                                                               95 100                                                                               95 50 100                                                                               100                                                                               95 95 100                       Green foxtail                                                                          95 70 95 50 90 70 100                                                                               40 95 95 15 100                                                                               100                                                                               100                                                                               85 100                       Johnsongrass                                                                           100                                                                               70 100                                                                               50 40 30 100                                                                               95 95 100                                                                               80 100                                                                               100                                                                               95 95 100                               Compound No.                                                                   33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48                                Rate (kg/ha)                                                                   1.0                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               1.0                                                                               1.0                                                                                1.0                                                                              0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               1.0                       __________________________________________________________________________     Cotton  100                                                                               95 100                                                                               80 95 95 100                                                                               100                                                                               95 95 90 100                                                                               90 15    8                         Soybean 95 95 95 80 100                                                                               100                                                                               100                                                                               95 100                                                                               95 90 95 95 50 85 100                       Corn    90 100                                                                               100                                                                               90 100                                                                               100                                                                               95 95 95 70 90 100                                                                               95 40 70 100                       Rice    30 70 70 15 95 70 80 50 70 40 40 20 20 5     70                        Wheat   50 90 95 30 95 95 90 70 100                                                                               85 70 70 60 10 30 90                        Morningglory                                                                           100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95 100                                                                               100                                                                               100                                                                               100                                                                               50 100                                                                               100                       Wild mustard                                                                           100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               90 95 100                                                                               95 80    100                       Velvetleaf                                                                             100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                       Barnyardgrass                                                                          90 100                                                                               100                                                                               50 100                                                                               100                                                                               90 100                                                                               95 80 50 95 95 20    100                       Green foxtail                                                                          95 100                                                                               100                                                                               50 70 90 70 95 100                                                                               90 95 95 95 10 90 100                       Johnsongrass                                                                           95 100                                                                               100                                                                               95 100                                                                               100                                                                               95 100                                                                               95 70 95 100                                                                               100                                                                               20 85 100                       Blackgrass                                        15                           Chickweed                                         70                           Cocklebur                                         70                                   Compound No.                                                                   49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64                                Rate (kg/ha)                                                                   0.5                                                                               0.5                                                                               0.25                                                                              0.5                                                                               1.0                                                                               1.0                                                                               0.5                                                                               0.5                                                                               1.0                                                                               1.0                                                                               0.5                                                                               0.5                                                                               0.5                                                                               1.0                                                                               0.5                                                                               0.5                       __________________________________________________________________________     Cotton  95 95    95 100                                                                               95 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               90                        Soybean 100                                                                               95 90 90 95 95 100                                                                               100                                                                               100                                                                               100                                                                               90 100                                                                               95 100                                                                               95 95                        Corn    100                                                                               85 60 70 95 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95 95 95                        Rice    50 60    5  85 30 95 95 100                                                                               100                                                                               90 50 10 15 90 50                        Wheat   85 80 20 30 85 95 100                                                                               100                                                                               100                                                                               100                                                                               95 100                                                                               40 90 95 90                        Morningglory                                                                           100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                       Wild mustard                                                                           100                                                                               100   100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               90 100                                                                               100                                                                               95 100                       Velvetleaf                                                                             100                                                                               100                                                                               95 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                       Barnyardgrass                                                                          100                                                                               100   20 100                                                                               80 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95 95 95 90 95                        Green foxtail                                                                          100                                                                               95 40 30 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               90 50 90 100                                                                               70 70                        Johnsongrass                                                                           95 100   30 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               90 90 100                                                                               90 100                       Blackgrass    40                                                               Chickweed     90                                                               Cocklebur     90                                                                       Compound No.                                                                   65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80                                Rate (kg/ha)                                                                   0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.5                                                                               0.125                                                                             0.25                                                                              0.5                                                                               0.5                       __________________________________________________________________________     Cotton  70 100                                                                               100                                                                               100                                                                               100                                                                               95 100                                                                               100         100   100                                                                               100                          Soybean 95 90 100                                                                               95 85 90 95 70 80 95 60 95 90 85 95 60                        Corn    95 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               5  100                                                                               30 100                                                                               30 90 95 40                        Rice    50 5  90 50 30 5  70 5           40    20 70                           Wheat   70 60 100                                                                               95 95 90 95 100                                                                               30 -- 60 95 15 90 90 30                        Morningglory                                                                           100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               80 100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                       Wild mustard                                                                           100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100         100   100                                                                               100                          Velvetleaf                                                                             100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               100                                                                               95 100                                                                               90 100                                                                               100                                                                               100                                                                               100                                                                               90 100                                                                               100                       Barnyardgrass                                                                          50 70 100                                                                               90 50 85 30 85          95    100                                                                               80                           Green foxtail                                                                          20 80 100                                                                               100                                                                               100                                                                               100                                                                               50 95    100                                                                               100                                                                               100                                                                               70 80 95 80                        Johnsongrass                                                                           95 70 100                                                                               95 90 60 80 85    95 95 80 10 70 90 70                        Blackgrass                      10 85 10    15       30                        Chickweed                       100                                                                               100                                                                               100   70       0                         Cocklebur                       95 100                                                                               100   95       95                        __________________________________________________________________________ 

I claim:
 1. A herbicidal compound of the formula ##STR23## wherein X is chlorine or fluorine, X¹ is hydrogen, chlorine, or fluorine, X² is chlorine, fluorine, trifluoromethyl, or ethoxy, and X³ is hydrogen, chlorine, fluorine, or CH₂ --N(CH₃ (CH₂ C═CH); M is --N--; and R¹ is --CH═C(--R²)--C(═O)--Z--[S(O)₂ ]_(n--R) ³ wherein R² is hydrogen or methyl; Z is --O--, --S-- or --NR⁴ ; and n is 0 or 1;when Z is --O-- or --S-- and n is 0, R³ is hydrogen, sodium, lower alkyl, cyanomethyl, propargyl, yl, phenylmethyl optionally substituted in the 4-position with methylthio, and --R⁵ --COR⁶, where R⁵ is a divalent alkylene of 1 to 3 carbons and R⁶ is hydrogen, amino, dimethylamino, methylsulfonylamino, or an alkoxy of 1 to 4 carbons; p1 when Z is NR⁴ -- and n is 0, R³ is hydrogen, lower alkyl, methoxy, 1-cyanoethyl, 1-(ethoxycarbonyl)methyl, phenylmethyl, and phenyl; and R⁴ is hydrogen, methyl, or --C₂ H₅ OC₂ H₅ -- taken with R³ to form a morpholine ring; when Z is --NR⁴ -- and n is 1, R³ is lower alkyl, trifluoromethyl, cyclohexylmethyl, 2-phenylethyl, 2-phenylethenyl, amino, d-10-camphoryl, 3,5-dimethylisoxazol-4-yl, phenylmethyl optionally substituted with one or more of chlorine, bromine, fluorine, or methyl, and phenyl optionally substituted with chlorine or methyl; and R⁴ is hydrogen; in addition, when R² is hydrogen and R³ is lower alkyl or phenylmethyl, R⁴ may be sodium.
 2. A compound of claim 1 in which X is chlorine, X¹ is hydrogen or chlorine, X² is chlorine or trifluoromethyl, and X³ is hydrogen; and Z is --O-- or --NR⁴.
 3. A compound of claim 2 in which Z is --O--, n is 0, and R³ is hydrogen, sodium, ethyl, phenyl or --R⁵ --COR⁶ in which R⁶ is hydroxy or an alkoxy of 1 to 4 carbons.
 4. A compound of claim 2 in which Z is --NR⁴ --, n is 0; R³ is hydrogen, lower alkyl, ethoxycarbonylmethyl, phenylmethyl, or phenyl; and R⁴ is hydrogen, methyl, or taken with R³ --C₂ H₅ OC₂ H₅ -- to form a morpholine ring.
 5. A compound of claim 2 in which Z is --NR⁴ --, n is 1, and R³ is lower alkyl of 1 to 4 carbon atoms, or phenylmethyl optionally substituted with one or two of chlorine or methyl; and R⁴ is hydrogen; in addition when R² is hydrogen, and R³ is methyl, 1-methylethyl, or phenylmethyl, R⁴ may also be sodium.
 6. A compound of claim 2 in which M is --N--, X is chlorine, X¹ , X³, R², and R⁴ are hydrogen, and X² is trifluoromethyl.
 7. A compound of claim 6 in which Z is --O--, n is 0, R³ is hydrogen, sodium, methyl, ethyl, carboxymethyl, 1-carboxyethyl, methoxycarbonylmethyl, ethoxycarbonylmethyl, 1,1-dimethylethoxycarbonylmethyl, 1-(methoxycarbonyl)ethyl, 1-(1,1-dimethylethoxycarbonyl)ethyl, or phenylmethyl.
 8. A compound of claim 6 in which Z is --NR⁴ --, n is 0, R³ is hydrogen, methyl, or 1-methylpropyl; and R⁴ is hydrogen or methyl.
 9. A compound of claim 6, in which Z is --NR⁴ --, and n is 1, R³ is lower alkyl of 1 to 4 carbon atoms or phenylmethyl; and R⁴ is hydrogen; in addition when R² is hydrogen, and R³ is methyl, R⁴ may also be sodium.
 10. The compound of claim 9 in which R³ is phenylmethyl.
 11. An herbicidal composition comprising an herbicidally effective amount of a compound of claim 1 in admixture with a suitable carrier.
 12. A method for controlling undesired plant growth which comprises applying to the locus where control is desired an herbicidally effective amount of a composition of claim
 11. 